Remove unused WebApkInstaller::Register()

chrome/browser/android/webapk/webapk_installer.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALLER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALLER_H_
 
 #include <jni.h>
 #include <memory>
 
@@ skipping 27 matching lines @@
 // Talks to Chrome WebAPK server and Google Play to generate a WebAPK on the
 // server, download it, and install it.
 class WebApkInstaller : public net::URLFetcherDelegate {
  public:
   using FinishCallback = base::Callback<void(bool)>;
 
   WebApkInstaller(const ShortcutInfo& shortcut_info,
                   const SkBitmap& shorcut_icon);
   ~WebApkInstaller() override;
 
-  // Register JNI methods.
-  static bool Register(JNIEnv* env);
-
   // Talks to the Chrome WebAPK server to generate a WebAPK on the server and to
   // Google Play to install the generated WebAPK. Calls |callback| after the
   // request to install the WebAPK is sent to Google Play.
   void InstallAsync(content::BrowserContext* browser_context,
                     const FinishCallback& callback);
 
   // Same as InstallAsync() but uses the passed in |request_context_getter|.
   void InstallAsyncWithURLRequestContextGetter(
       net::URLRequestContextGetter* request_context_getter,
       const FinishCallback& callback);
@@ skipping 73 matching lines @@
   // WebAPK server URL.
   GURL server_url_;
 
   // Used to get |weak_ptr_| on the IO thread.
   base::WeakPtrFactory<WebApkInstaller> io_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkInstaller);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALLER_H_